Fix return type of ListOfNonstandardBridges

[blegat]

This is now checked
jump-dev/MathOptInterface.jl#2665
so SCS does not even precompile

ERROR: LoadError: TypeError: in typeassert, expected Vector{Type}, got a value of type Vector{UnionAll}
Stacktrace:
  [1] get(model::MathOptInterface.Utilities.CachingOptimizer{SCS.Optimizer, MathOptInterface.Utilities.UniversalFallback{MathOptInterface.Utilities.Model{Float64}}}, attr::MathOptInterface.Bridges.ListOfNonstandardBridges{Float64})
    @ MathOptInterface.Utilities ~/.julia/packages/MathOptInterface/yI6C0/src/Utilities/cachingoptimizer.jl:1047
  [2] full_bridge_optimizer(model::MathOptInterface.Utilities.CachingOptimizer{SCS.Optimizer, MathOptInterface.Utilities.UniversalFallback{MathOptInterface.Utilities.Model{Float64}}}, ::Type{Float64})
    @ MathOptInterface.Bridges ~/.julia/packages/MathOptInterface/yI6C0/src/Bridges/Bridges.jl:58
  [3] instantiate(optimizer_constructor::Any; with_bridge_type::Type{Float64}, with_cache_type::Nothing)
    @ MathOptInterface ~/.julia/packages/MathOptInterface/yI6C0/src/instantiate.jl:190
  [4] macro expansion
    @ ~/.julia/dev/SCS/src/SCS.jl:33 [inlined]
  [5] macro expansion
    @ ~/.julia/packages/PrecompileTools/L8A3n/src/workloads.jl:78 [inlined]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.76%. Comparing base (d1a2d70) to head (0391c10).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #309   +/-   ##
=======================================
  Coverage   96.76%   96.76%           
=======================================
  Files           8        8           
  Lines         433      433           
=======================================
  Hits          419      419           
  Misses         14       14           

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